UnattendedUpgrades should include all added repositories (rspam, sury php and GoAccess) if used. Currently only sure php is added to the config file. Besides `Unattended-Upgrade::Mail "root";` should be set as of the recommendation of the [Debian Wiki](https://wiki.debian.org/UnattendedUpgrades#Unattended_Upgrades). `codename=${distro_codename}-updates` is also added as repository, because it doesn't harm if it is not part of `sources.list` and it should be used if it is there. Putting the data in `/etc/apt/apt.conf.d/51unattended-upgrades` instead of `50unattended-upgrades` avoids problems during updates. The attached merge request modifies the behavior of the Autoinstaller as described. P.S.: `unattended-upgrade -d --dry-run` allows to verify that the config files `50unattended-upgrades` and `51unattended-upgrades` are both read.